Logic app custom headers missing from HTTP request

Question

Logic app custom headers missing from HTTP request

Markus Unelius 0

We have API as an App Service that sends HTTP request to Logic App. The request contains a specific custom header "x-api-key". Starting from the evening of November 13, 2025 this header started missing from the received request in the Logic App's end. There was no deployments of the API or the Logic App that could have caused the issue. It had worked without any issues for years before this. Our Logic App reads the value of this header, but since it is missing now, that operation fails.

Has anyone faced similar problem with Logic Apps?

Praveen Kumar Gudipudi 1,495 Reputation points Microsoft External Staff Moderator

2025-11-21T13:47:02.4166667+00:00
Hello Markus Unelius,

Could you please provide below details to proceed further:

tell me whether the Logic App is Consumption or Standard?

Please share me HTTP request trigger screenshot?

Also, which method you're using in Http request, if you're not using GET method please try using GET method.
Praveen Kumar Gudipudi 1,495 Reputation points Microsoft External Staff Moderator

2025-11-24T11:06:45.4266667+00:00

Hello Markus Unelius,

We haven’t heard from you on the last response and was just checking back to see if you have a resolution yet. In case if you have any resolution please do share that same with the community as it can be helpful to others. Otherwise, will respond with more details and we will try to help.

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Praveen Kumar Gudipudi 1,495 Reputation points Microsoft External Staff Moderator

2025-11-21T13:47:02.4166667+00:00

Hello Markus Unelius,

Could you please provide below details to proceed further:

tell me whether the Logic App is Consumption or Standard?

Please share me HTTP request trigger screenshot?

Also, which method you're using in Http request, if you're not using GET method please try using GET method.
Praveen Kumar Gudipudi 1,495 Reputation points Microsoft External Staff Moderator

2025-11-24T11:06:45.4266667+00:00

Hello Markus Unelius,

We haven’t heard from you on the last response and was just checking back to see if you have a resolution yet. In case if you have any resolution please do share that same with the community as it can be helpful to others. Otherwise, will respond with more details and we will try to help.

Answer 1

The issue you're experiencing with the missing custom header "x-api-key" in your Logic App could be related to how Azure Logic Apps handle certain HTTP headers. Azure Logic Apps automatically remove specific headers from incoming requests without warning. According to the documentation, the following headers are omitted:

Accept-* headers except for Accept-version
Allow
Content-* headers except for Content-Disposition, Content-Encoding, and Content-Type (only honored in POST and PUT operations)
Cookie
Expires
Host
Last-Modified
Origin
Set-Cookie
Transfer-Encoding

While the x-api-key header is not explicitly listed among the omitted headers, it is important to ensure that it is being sent correctly and that there are no other issues in the API or Logic App configuration that might affect its transmission.

If the issue persists, consider checking for any changes in the API configuration or network settings that could have inadvertently affected the header's delivery. Additionally, you might want to inspect the request using tools like APIM inspector trace to see how the request is processed within the Logic App pipeline.

References:

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Logic app custom headers missing from HTTP request

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